a. Purpose of reamers. Reamers are used to smoothly enlarge drilled holes to
an exact size and to finish the hole at the same time. Reamers are also used to
remove burs from the inside diameters of pipe and drilled holes.
b. Types of reamers.
(1) Solid straight hole reamers. Solid straight hole reamers (fig 23) are
made of one solid piece of high speed steel having a straight shank and straight or
spiral flutes. The cutting edges or lands between the flutes are usually evenly
spaced. However, some solid reamers have irregularly spaced lands to prevent the
tool from chattering. Solid straight shank, straight flute reamers are issued in
sizes from 1/16 inch up to and including 3 inches in diameter. These reamers are
also issued in sets encased in a wood or metal box containing 25 reamers sized from
1/8 to 1/2 inch and progressing by 1/64-inch increments. Other reamer sets include
solid taper pin reamers in addition to the solid straight hole reamers. Each
reamer size is stamped on the shank of the tool.
Solid straight hole and taper pin reamers.
(2) Solid taper pin reamers. Solid taper pin reamers (fig 23) are used to
finish tapered holes for the insertion of tapered pins or other tapered parts.
They are made with a standard taper of 1/4 inch per foot. Solid taper pin reamers
are issued with straight or spiral flutes in sizes ranging from Nos 5/0 to 14, with
diameters at the large end of the reamer ranging from 0.0984 to 1.5412 inches.
These reamers are also issued in sets of 10 reamers--Nos 3/0 to 7--and a set of 11
reamers--Nos 0 to 10. As mentioned above, they are also included in mixed sets of
both straight hole and taper pin reamers,